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Dresden 2020 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 65: Plasmonics and Nanooptics IV: Waveguides and Antennas

O 65.10: Vortrag

Mittwoch, 18. März 2020, 12:45–13:00, WIL A317

Coupling of phosphorescent single molecules to plasmonic nanostructures — •Marcel Krumrein1, Maximilian Rödel1, Ulrich Müller1, and Jens Pflaum1,21Experimental Physics VI, Julius Maximilian University of Würzburg, 97074 Würzburg — 2Bavarian Center for Applied Energy Research (ZAE Bayern), 97074 Würzburg

Phosphorescent materials are widely used in OLED applications to improve the external quantum efficiency of these devices. After excitation, the intersystem crossing in such molecules converts the S1 singlet state into a long-living T1 triplet state where a radiative, phosphorescent decay into the S0 ground state takes place on, typically, µs time scale. In this work we couple single molecules of the phosphorescent emitter Ir(piq)3 to plasmonic nanostructures to influence their dynamics and, thus, their effective emissive rates. For this purpose, long-range ordered metallic nanoarrays were fabricated by means of shadow nanosphere lithography and the Ir(piq)3-doped PMMA host-guest system was deposited via spin-coating on-top. Effects by coupling to the underlying plasmonic array were investigated by lifetime analysis and photon-correlation functions measured with a confocal microscope setup. By comparison with Ir(piq)3:PMMA reference samples on glass we observe an enhancement of the emission intensity by more than an order of magnitude which indicates a change of the intramolecular transition rates in proximity to the metallic nanostructures. We will discuss these results in context to the implementation of metal-organic hybrid structures in electrically driven photonic devices.

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